Mercurial > hg > graal-compiler
annotate src/share/vm/utilities/taskqueue.cpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | 8b10f48633dc |
| children | f08d439fab8c |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1638 | 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "oops/oop.inline.hpp" | |
| 27 #include "runtime/os.hpp" | |
| 28 #include "utilities/debug.hpp" | |
| 29 #include "utilities/stack.inline.hpp" | |
| 30 #include "utilities/taskqueue.hpp" | |
| 31 #ifdef TARGET_OS_FAMILY_linux | |
| 32 # include "thread_linux.inline.hpp" | |
| 33 #endif | |
| 34 #ifdef TARGET_OS_FAMILY_solaris | |
| 35 # include "thread_solaris.inline.hpp" | |
| 36 #endif | |
| 37 #ifdef TARGET_OS_FAMILY_windows | |
| 38 # include "thread_windows.inline.hpp" | |
| 39 #endif | |
| 0 | 40 |
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41 #ifdef TRACESPINNING |
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42 uint ParallelTaskTerminator::_total_yields = 0; |
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43 uint ParallelTaskTerminator::_total_spins = 0; |
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44 uint ParallelTaskTerminator::_total_peeks = 0; |
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45 #endif |
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46 |
| 1665 | 47 #if TASKQUEUE_STATS |
| 48 const char * const TaskQueueStats::_names[last_stat_id] = { | |
| 49 "qpush", "qpop", "qpop-s", "qattempt", "qsteal", "opush", "omax" | |
| 50 }; | |
| 51 | |
| 1709 | 52 TaskQueueStats & TaskQueueStats::operator +=(const TaskQueueStats & addend) |
| 53 { | |
| 54 for (unsigned int i = 0; i < last_stat_id; ++i) { | |
| 55 _stats[i] += addend._stats[i]; | |
| 56 } | |
| 57 return *this; | |
| 58 } | |
| 59 | |
| 1665 | 60 void TaskQueueStats::print_header(unsigned int line, outputStream* const stream, |
| 61 unsigned int width) | |
| 62 { | |
| 63 // Use a width w: 1 <= w <= max_width | |
| 64 const unsigned int max_width = 40; | |
| 65 const unsigned int w = MAX2(MIN2(width, max_width), 1U); | |
| 66 | |
| 67 if (line == 0) { // spaces equal in width to the header | |
| 68 const unsigned int hdr_width = w * last_stat_id + last_stat_id - 1; | |
| 69 stream->print("%*s", hdr_width, " "); | |
| 70 } else if (line == 1) { // labels | |
| 71 stream->print("%*s", w, _names[0]); | |
| 72 for (unsigned int i = 1; i < last_stat_id; ++i) { | |
| 73 stream->print(" %*s", w, _names[i]); | |
| 74 } | |
| 75 } else if (line == 2) { // dashed lines | |
| 76 char dashes[max_width + 1]; | |
| 77 memset(dashes, '-', w); | |
| 78 dashes[w] = '\0'; | |
| 79 stream->print("%s", dashes); | |
| 80 for (unsigned int i = 1; i < last_stat_id; ++i) { | |
| 81 stream->print(" %s", dashes); | |
| 82 } | |
| 83 } | |
| 84 } | |
| 85 | |
| 86 void TaskQueueStats::print(outputStream* stream, unsigned int width) const | |
| 87 { | |
| 88 #define FMT SIZE_FORMAT_W(*) | |
| 89 stream->print(FMT, width, _stats[0]); | |
| 90 for (unsigned int i = 1; i < last_stat_id; ++i) { | |
| 91 stream->print(" " FMT, width, _stats[i]); | |
| 92 } | |
| 93 #undef FMT | |
| 94 } | |
| 1709 | 95 |
| 96 #ifdef ASSERT | |
| 97 // Invariants which should hold after a TaskQueue has been emptied and is | |
| 98 // quiescent; they do not hold at arbitrary times. | |
| 99 void TaskQueueStats::verify() const | |
| 100 { | |
| 101 assert(get(push) == get(pop) + get(steal), | |
| 102 err_msg("push=" SIZE_FORMAT " pop=" SIZE_FORMAT " steal=" SIZE_FORMAT, | |
| 103 get(push), get(pop), get(steal))); | |
| 104 assert(get(pop_slow) <= get(pop), | |
| 105 err_msg("pop_slow=" SIZE_FORMAT " pop=" SIZE_FORMAT, | |
| 106 get(pop_slow), get(pop))); | |
| 107 assert(get(steal) <= get(steal_attempt), | |
| 108 err_msg("steal=" SIZE_FORMAT " steal_attempt=" SIZE_FORMAT, | |
| 109 get(steal), get(steal_attempt))); | |
| 110 assert(get(overflow) == 0 || get(push) != 0, | |
| 111 err_msg("overflow=" SIZE_FORMAT " push=" SIZE_FORMAT, | |
| 112 get(overflow), get(push))); | |
| 113 assert(get(overflow_max_len) == 0 || get(overflow) != 0, | |
| 114 err_msg("overflow_max_len=" SIZE_FORMAT " overflow=" SIZE_FORMAT, | |
| 115 get(overflow_max_len), get(overflow))); | |
| 116 } | |
| 117 #endif // ASSERT | |
| 1665 | 118 #endif // TASKQUEUE_STATS |
| 119 | |
| 0 | 120 int TaskQueueSetSuper::randomParkAndMiller(int *seed0) { |
| 121 const int a = 16807; | |
| 122 const int m = 2147483647; | |
| 123 const int q = 127773; /* m div a */ | |
| 124 const int r = 2836; /* m mod a */ | |
| 125 assert(sizeof(int) == 4, "I think this relies on that"); | |
| 126 int seed = *seed0; | |
| 127 int hi = seed / q; | |
| 128 int lo = seed % q; | |
| 129 int test = a * lo - r * hi; | |
| 130 if (test > 0) | |
| 131 seed = test; | |
| 132 else | |
| 133 seed = test + m; | |
| 134 *seed0 = seed; | |
| 135 return seed; | |
| 136 } | |
| 137 | |
| 138 ParallelTaskTerminator:: | |
| 139 ParallelTaskTerminator(int n_threads, TaskQueueSetSuper* queue_set) : | |
| 140 _n_threads(n_threads), | |
| 141 _queue_set(queue_set), | |
| 142 _offered_termination(0) {} | |
| 143 | |
| 144 bool ParallelTaskTerminator::peek_in_queue_set() { | |
| 145 return _queue_set->peek(); | |
| 146 } | |
| 147 | |
| 148 void ParallelTaskTerminator::yield() { | |
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149 assert(_offered_termination <= _n_threads, "Invariant"); |
| 0 | 150 os::yield(); |
| 151 } | |
| 152 | |
| 153 void ParallelTaskTerminator::sleep(uint millis) { | |
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154 assert(_offered_termination <= _n_threads, "Invariant"); |
| 0 | 155 os::sleep(Thread::current(), millis, false); |
| 156 } | |
| 157 | |
| 342 | 158 bool |
| 159 ParallelTaskTerminator::offer_termination(TerminatorTerminator* terminator) { | |
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160 assert(_n_threads > 0, "Initialization is incorrect"); |
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161 assert(_offered_termination < _n_threads, "Invariant"); |
| 0 | 162 Atomic::inc(&_offered_termination); |
| 163 | |
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164 uint yield_count = 0; |
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165 // Number of hard spin loops done since last yield |
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166 uint hard_spin_count = 0; |
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167 // Number of iterations in the hard spin loop. |
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168 uint hard_spin_limit = WorkStealingHardSpins; |
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169 |
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170 // If WorkStealingSpinToYieldRatio is 0, no hard spinning is done. |
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171 // If it is greater than 0, then start with a small number |
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172 // of spins and increase number with each turn at spinning until |
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173 // the count of hard spins exceeds WorkStealingSpinToYieldRatio. |
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174 // Then do a yield() call and start spinning afresh. |
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175 if (WorkStealingSpinToYieldRatio > 0) { |
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176 hard_spin_limit = WorkStealingHardSpins >> WorkStealingSpinToYieldRatio; |
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177 hard_spin_limit = MAX2(hard_spin_limit, 1U); |
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178 } |
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179 // Remember the initial spin limit. |
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180 uint hard_spin_start = hard_spin_limit; |
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181 |
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182 // Loop waiting for all threads to offer termination or |
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183 // more work. |
| 0 | 184 while (true) { |
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185 assert(_offered_termination <= _n_threads, "Invariant"); |
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186 // Are all threads offering termination? |
| 0 | 187 if (_offered_termination == _n_threads) { |
| 188 return true; | |
| 189 } else { | |
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190 // Look for more work. |
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191 // Periodically sleep() instead of yield() to give threads |
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192 // waiting on the cores the chance to grab this code |
| 0 | 193 if (yield_count <= WorkStealingYieldsBeforeSleep) { |
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194 // Do a yield or hardspin. For purposes of deciding whether |
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195 // to sleep, count this as a yield. |
| 0 | 196 yield_count++; |
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197 |
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198 // Periodically call yield() instead spinning |
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199 // After WorkStealingSpinToYieldRatio spins, do a yield() call |
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200 // and reset the counts and starting limit. |
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201 if (hard_spin_count > WorkStealingSpinToYieldRatio) { |
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202 yield(); |
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203 hard_spin_count = 0; |
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204 hard_spin_limit = hard_spin_start; |
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205 #ifdef TRACESPINNING |
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206 _total_yields++; |
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207 #endif |
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208 } else { |
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209 // Hard spin this time |
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210 // Increase the hard spinning period but only up to a limit. |
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211 hard_spin_limit = MIN2(2*hard_spin_limit, |
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212 (uint) WorkStealingHardSpins); |
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213 for (uint j = 0; j < hard_spin_limit; j++) { |
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214 SpinPause(); |
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215 } |
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216 hard_spin_count++; |
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217 #ifdef TRACESPINNING |
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218 _total_spins++; |
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219 #endif |
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220 } |
| 0 | 221 } else { |
| 222 if (PrintGCDetails && Verbose) { | |
| 223 gclog_or_tty->print_cr("ParallelTaskTerminator::offer_termination() " | |
| 224 "thread %d sleeps after %d yields", | |
| 225 Thread::current(), yield_count); | |
| 226 } | |
| 227 yield_count = 0; | |
| 228 // A sleep will cause this processor to seek work on another processor's | |
| 229 // runqueue, if it has nothing else to run (as opposed to the yield | |
| 230 // which may only move the thread to the end of the this processor's | |
| 231 // runqueue). | |
| 232 sleep(WorkStealingSleepMillis); | |
| 233 } | |
| 234 | |
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235 #ifdef TRACESPINNING |
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236 _total_peeks++; |
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237 #endif |
| 342 | 238 if (peek_in_queue_set() || |
| 239 (terminator != NULL && terminator->should_exit_termination())) { | |
| 0 | 240 Atomic::dec(&_offered_termination); |
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241 assert(_offered_termination < _n_threads, "Invariant"); |
| 0 | 242 return false; |
| 243 } | |
| 244 } | |
| 245 } | |
| 246 } | |
| 247 | |
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248 #ifdef TRACESPINNING |
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249 void ParallelTaskTerminator::print_termination_counts() { |
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250 gclog_or_tty->print_cr("ParallelTaskTerminator Total yields: %lld " |
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251 "Total spins: %lld Total peeks: %lld", |
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252 total_yields(), |
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253 total_spins(), |
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254 total_peeks()); |
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255 } |
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256 #endif |
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257 |
| 0 | 258 void ParallelTaskTerminator::reset_for_reuse() { |
| 259 if (_offered_termination != 0) { | |
| 260 assert(_offered_termination == _n_threads, | |
| 261 "Terminator may still be in use"); | |
| 262 _offered_termination = 0; | |
| 263 } | |
| 264 } | |
| 265 | |
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266 #ifdef ASSERT |
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267 bool ObjArrayTask::is_valid() const { |
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268 return _obj != NULL && _obj->is_objArray() && _index > 0 && |
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269 _index < objArrayOop(_obj)->length(); |
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270 } |
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271 #endif // ASSERT |
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272 |
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273 void ParallelTaskTerminator::reset_for_reuse(int n_threads) { |
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274 reset_for_reuse(); |
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275 _n_threads = n_threads; |
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276 } |
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277 |